Improvement in telescopic quadrant-hinge



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Lenen Patent No. 93,402, dma August 10, 1869.

IMPROVEMENT IN TnLnscoPIc QUAnRANT-HINGE.

The Schedule referred to in these Letters Patent and making part of thename.

To all whom it may concern.-

Beit known that I, Amos S. BLAKE, of Waterbury,

inthe county of New Haven, and State of Connecticut, have invented 'anewvand improved Telescopic Piano- Hinge; and I do hereby declare thatthe following is a' full, clear, and exact description thereof,v whichwill enable others skilled in the art to make' and use the same,reference being had to the accompanying drawings, forming part of thisspecification, in which- Figure 1 is a detail sectional view of myimproved hinge, taken through the line a: x, iig. 3.

vFigure 2 is a side view of the same.

Figure 3' is a detail sectional view of the same, taken through the liney y, fig. 1.

and arranged 'as to leave the surface of the wood-work.

to which it is attached entirely smooth for convenience in finishing andpolishing said wood-work and in using the instrument; `and It consistsin the telescopic hinge, constructed as hereinafter more fullydescribed.

A represents the wood-work to which my improved hinge has been attached.i

`B O D are the main part-s of Athe hinge, which are made curved in thearc of a circle, and the two outer parts C D'are made tubular, so thatthe parts of the hinge, in opening and closing, may slide upon eachother in the manner 'of a telescope;

The parts B and D are. securely attached to, or are formed solid withthe plates E, by means of which the hinge is secured to the wood-Work A.

Similar letters of reference indicate corresponding The inner surfaceoftheouter sides of the parts "Ct and D are grooved longitudinally, andhave stop-pins or projections secured or formed'in' them,'.against'which stop-pins or projections formed upon or attached to the outersides of the inner parts B and O may strike, to limit the movement ofsaid parts upon each other.

'These stops should be so arranged that each part may move uponfthe nextinner part through an arc of about one-quarter of a circle.

The central parts b'c'd, of the parts B C D, are depressed, as shown infig. 2, so as toserve as a pivot or centre-pin to the hingein itsmovements.

Thev hinge, when closed, as shown iu'g. 1, should be a little less thana semcircle, the fcentre of the circle being the edges of the adjacentparts of the wood-work to which the hinges are attached, ,so that thesaidA edges may be -in close contact 'with but not rub each other as'the hinged part of said wood-work is'mo'ved.

1n the case of organs and other articles where the hinged part, in beingopened, is not required to swing through the arc of a semicircle', orinto a position parallel with its former position, as shown in igs. 1and 2, the part O of the hinge may be omitted, onlytwo parts being used.Y

Having thus described my invention,

I claim as new, and desirel to secure by Letters `Patent-- An4 improvedlhinge, made 'in parts so constructed as to slide upon each other in themanner of a telescope, for the purpose set. forth.

' AMOS S. BLAKE. Witnesses:

WILLARD SPENCER, E. LEAVENWORTH.

